Chelsea, MA Profile: Facts & Data


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Chelsea, Massachusetts - Basic Facts

The City of Chelsea had a population of 39,171 as of July 1, 2018. Chelsea ranks in the upper quartile for Population Density and Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Massachusetts. See peer rankings below.

The primary coordinate point for Chelsea is located at latitude 42.3968 and longitude -71.0313 in Suffolk County. The formal boundaries for the City of Chelsea (see map below) encompass a land area of 2.21 sq. miles and a water area of 0.25 sq. miles. Suffolk County is in the Eastern time zone (GMT -5). The elevation is 39 feet.

The City of Chelsea (GNIS ID: 619464) has a C5 Census Class Code which indicates an active incorporated place that is independent of any county subdivision and serves as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

Alternate Unofficial Names for Chelsea: Romney Marsh, Rumney Marsh, Winisemit, Winne-ashim-ut, Winnet Semet, Winnisemit, Winnisimmet, Winnissimmet.

Jump to... (On This Page!)
  1. Chelsea 2018 Demographic Data
  2. Growth Rates for Chelsea (Historical & 5-Year Forecast)
  3. Peer Comparisons (Rank and Percentile)
  1. Neighborhoods Demographics (Home Values, Household Income, etc.)
  2. Massachusetts Research Tools (Easy Tools & Current Data)
  3. Massachusetts Data Comparison Tool - 2018 Demographics

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Boundary Maps, Demographic Data, School Zones Review maps and data for the neighborhood, city, county, ZIP Code, and school zone. July 1, 2018, data includes home values, household income, percentage of homes owned, rented or vacant, etc.


Chelsea, MA Data & Demographics (As of July 1, 2018)


Total Population 39,171
Population in Households 38,440
Population in Familes 29,226
Population in Group Qrtrs 731
Population Density2 17,707
Diversity Index3 89


Median Household Income $42,941
Average Household Income $59,283
Per Capita Income $19,864


Total Housing Units 13,622 (100%)
Owner Occupied HU 3,736 (27.4%)
Renter Occupied HU 9,134 (67.1%)
Vacant Housing Units 752 ( 5.5%)
Median Home Value $328,397
Average Home Value $353,105


Total Households 12,870
Average Household Size 2.99
Family Households 8,046
Average Family Size 4
  1. Demographics are point estimates for July 1st of the current year and each for the forecast years. See References for more information.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2018 2018-2023
Population 1.31% 0.99%
Households 1.03% 0.82%
Families 1.06% 0.87%
Median Household Income   3.6%
Per Capita Income   3.59%

Chelsea, MA - Peer Comparisons by Rank and Percentile

The table below compares Chelsea to the other 246 incorporated cities, towns and CDPs in Massachusetts by rank and percentile using July 1, 2018 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 39 85th
Population Density # 3 99th
Diversity Index # 2 100th
Median Household Income # 235 5th
Per Capita Income # 242 2nd

Additional comparisons and rankings can be made with a VERY EASY TO USE Massachusetts Census Data Comparison Tool.

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